Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0f6b71314e9428bb02995778e4e3e594680639863acc0cd478232ef805a264fd' 
  AND token = 'qwOEMpZdvFqx41/FNFQtdhMN2xWZXFjAZ6kUHsPZASs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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