Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bf70e68bbe7bdfcf1e2c78662ca5c4c76391e09eaad1254902e80fa098bb558a' 
  AND token = 'fDKjSlR4OJfehFOYAJvPSdPL/peH1PwO5kaRdjr8PQY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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