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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2bbf6144ef12622ad0b6cfd65db81140accb38a11ca73488afa781f3dc73114d' 
  AND token = 'Y/occdDVy+4+pkQIeD+2RoCJ/RWv7ET0xmpm/UnYV/A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00011

JSON explain

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