Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4ab31baaa640fbd9052de5541507808b3808c14895d3878ab41d1fe0ca4d9641' 
  AND token = '9fyyaVHPTsF60CoF1tFiqvOmhC/6qd5jY5wzcS9V8mc=' 
  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"
    }
  }
}