Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6de5c03c94d911fc07bf66477649b73b0304492534e5d7bc5864ba5b29984b02' 
  AND token = '6FWWtr4MKgjN4uuvOgViVZkl3yEVkeIiMLh0qx/mGaE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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