Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2891982d3062b0b59060e88643826272f38881c332f670d3387dc54d509ebb2f' 
  AND token = 'xS5V8jyCwGf0XN0x7TLLdytrWqfRkRUaKokRQ8ng45w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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