Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '82295c866864d20cc8d8fdde71633a0f973db40102adc9162921b89f8ebbf731' 
  AND token = 'jXdCzpgdWvzE2DlVJ1Dk2L1zWOjl820ukxLWYwVSwCw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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