Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '81feeb435acb8d5cbd116b710a3c1a23ce38a5c78379c8882e1e1ffcdd905df8' 
  AND token = '6GzwRGGjjLpOeG1UPhnSyMiQhI+H5zmKA+wGag1hh8s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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