Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9841b5c5db6cd40a132eccc7bbb37d1f95ad86b571732c391a16a3ec78db7ab1' 
  AND token = 'Q1aHz4Hb9ca3pIe67QE7awmyBdh/qSDWnDVdYl5Kqco=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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