Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8f474765c121b0b8c4b39308cdb4ecfc36f4c71da753945bc6632109aadb7cf3' 
  AND token = 'zj0PvPtd9vTzHAm776bEVD0EorswrEX2fl+z+pC/02k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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