Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '348ffa86a8c8536a4f92fad1bc2f9fd873964ef1a1cc7d47478e91186486cfc0' 
  AND token = 'W9NuQEUgj8f2wiZkPEQLndj1g84Um8sUvFBuJJJGXZw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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