Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c0aa67408819a71a2d2762426a2f627c9ae2240e141b3cb98228bff2b351b25d' 
  AND token = 'mb/AyPiW8ubN8I1wNiyofP0/P8hB7wcaS4lei99iePg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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