Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e6d09bf98abf753110be03e4e4bfa7a6fd659c7d02e437cb809cff9322e6f689' 
  AND token = 'b+1HC53dI8Z4Pl9OfOZetATNrPWxtv2Y0eb5BEiICC8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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