Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eb57d960a1691fb00f5ae93cedab4267c1c1bd092e9a8cafc1f3ab3e6f6c1db2' 
  AND token = 'aQXa190yh4F8lb17r38aLybcxBtoHxbmxF7oQfUOSOM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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