Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '741b1e90c491cafacbfe0a46bf4abc28f3fbd91964d014871b2760e43378b536' 
  AND token = 'O2bZRovRkLS1H6mfiHiOSSBXVM7qoLDg4EOu3GHcIbA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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