Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c849fa81c8a3bce46423cb0b12dba9de0057b1142aa6e5735b05eed37276b886' 
  AND token = 'BvPzfJmVQI/I+QB7d6kd2SME7CX03riGnFNrNKUoP8Y=' 
  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"
    }
  }
}