Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '41cd220b40a1c0b00f455f0a49f97e5e628465b58b523ae9e89cd716d0c9c756' 
  AND token = 'VCTFwqy3s7Bi7mVNQXuyYoRVBKm83eqmUAuhQnfo4G8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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