Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ad0809c6dc7079519e046a14666c1c52807d4e1e108a7d970ef0b5d3037c94a0' 
  AND token = 'Cpj2P7eZk4JMiYKy4Sr5V5zzu7IdusN1dG8lcphyTlQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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