Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7008a56a34b5f31456382be28a1724dafc7ff4ad68fd202a8235e0035f70e85c' 
  AND token = 'Tm2ks0LYPNqNveDZhFHkdsBZjeimPlrRDf8EvoXm6dU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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