Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bb156be4a14d1c4bf325aabdf2a1467f8f1909dc3fa3c58a294a7a3dd19b295d' 
  AND token = 'mWVk8eYN5MgdhxaH9/JgZ4GR076MNk5ANBKSng1Hkz0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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