Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '85c9c9ab36aea25c3f349e55f0e1f975806e4c2a15deadceedbcc55b45dcbe1e' 
  AND token = 'SCLov0bfuj5kW1Nz78Tu8CZ5vwO1pwXimhTwr3in1cA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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