Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '88065fd58d4ef4d73688d43d5d1b5812d4e0e9cac848f2644b7e6f2887a555d7' 
  AND token = 'e8iQcVLQtpqZKeQKFLdp7eS/Cj77V7kyHJR8ClazrGM=' 
  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"
    }
  }
}