Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ea8923640247a76f2a3d0a2811b93300028d0285909b4f5fcacc4f1a55dd6c7c' 
  AND token = 'qnrikHAd9qR7xdOlzMfhsh4IRm7uY9fkWrolKPQhk8o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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