Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b4b5b6702e65f2a51a954ae0d820017cca632c443a1dda9a30aa1914bd515805' 
  AND token = 'eJ2539VzvL2arifVgU0p5pJqP0br2LFInyZ0HteTSq4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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