Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eaf6f4187a849e52459b8fb0d2aeaeefba1b667d55fae6adf6940add9ee29c09' 
  AND token = 'A0Dd7pplW5A3nxX96dhFqJIMsw/C1FPW6HVVx5Y1qbw=' 
  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"
    }
  }
}