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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '558201cd7b03b418da235cc825e1968fc0dd2c16976c09246f09ae9bcf59b565' 
  AND token = 'DLh9jd4N34YorPHtpgu40u65Z+Y5NC4WaraIWGhj5a0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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