Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '41e0a03c432e61eeddb6793a30da73b8c5c1ec7ecd13a57e35cd5fe8fc938bb5' 
  AND token = 'PKfOgrv2RsXkTLOjHwROw1YvVOFay2yI8xt1Kz6Ly40=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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