Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'df6b20a79f7fbb802b30a4fb83be36bfeeedb739029ce537ca0d54f7084c428a' 
  AND token = '0gseR3hsSWiDN0uSZO1PY0WcpsOSxzZng440te4rEjc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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