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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bd4d621859f6e6ff1a51994981020055b0b9b9bbf02e93e1ff149db572c50f99' 
  AND token = 'JKqq/2P7569HcgABTNMrjmpmgECW3B0Dg/SrD35s2co=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00009

JSON explain

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