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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3120bd4c628c855cb6f4c93968b9d23feb7d0cd41f19a5e13071543e3b858ee4' 
  AND token = '+pnAuSKBVYzkQ59scpkyYvb1R9oiL0ABqSHQ0NujfxY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00010

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}