Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0f27998d482a93e2b1e277d9c45489fe6303b4d8118e2f3c9f6caa7879ae1e47' 
  AND token = 'aAgskt2obMnEM/Ua2cWMIqIiiePeATIdHd8CzpFRF8Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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