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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0747ab9f1e16f1192d7bcab3447661750736b7b0a8ac425d372637e4a9c6d255' 
  AND token = 'N7QJ3OJD1nxjmPimQMPk9LOaRx/4MVk2Kt4HEwXtgHY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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