SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ca5330678c82e502bec882b4986a668c175d9672614cc6b7b123a6e1f83f7da9' 
  AND token = 'Q1FPimWrhjCWKlBg0piOGZ5GKIJnQYp7QjtoE6GGoYM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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