Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8f42ff56ff1311659faf40b52463ea504632a78748031f0d0d6942d867e427f9' 
  AND token = 'QRk50aZhxBYNVhlFzAm9AG1RrSMadO7wZdnGGdlI/Gk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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