Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '82ef0a2ee274d942fb4e8a36da566bb0011e8945b4493ed6006211bf878356e4' 
  AND token = 'ivgXpqHDhZ+kzzfQXREEAnzJIpTLyHNZvKlaXkeTEOU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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