Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '38657f8bb74b311a6acf9dcf8f97514f4b4e0ad655b500f081dafa60801121b7' 
  AND token = '3diz99jR/m1+yt/WWXnGDofX3UzmPqb5iekUDXEP9dA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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