Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '44837f41f1fe3b762cfd485f31f1539c11e4c014d95dbd89b4cc60910ad916b6' 
  AND token = 'Sk84pnmS1GbXoyVn1eYbkcjN1PiSklg7CQWwmv5cVPQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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