SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '239c951d8ecff1232f79d74a2ba0ad76b1cad438456c22e7be46fd193eff12e1' 
  AND token = 'wByww0zbWAHgNGdS64VPsclgoRxxpQ9/zbvphscEZFI=' 
  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"
    }
  }
}