Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ebf91b16debd9050e91dffa5c94e4a73f95992109e089bf647b7c7905ef864e9' 
  AND token = 'PRZGjbUmTNVqYI1h2GQc4SHuTWazyzqhlrwfTnktmaY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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