Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '34ee7baa06a7ff738d684d2c6738ca20b23e606a39928a9ad79cff79114e2e44' 
  AND token = 'lMSrzWtpQ513I0tPKAYpm4t0YopsJQtjMByHJqp37e4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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