Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e9a873128cdff6e67b9f866ede38783d8df53baab84b51379827337c8a4ef624' 
  AND token = 'rPb3Ra1Bir8AwbaECtV83OqbEaSPlLYPQ9fP3WvwJ+c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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