Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '519c93ac43a92dc752a27a459b6c9dbf701c1d22be5df816f3e5c9e268b64671' 
  AND token = 'e0zXU1X4872KxpwQpwtW04at0sEJXa0D1Zhm6U/zMOQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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