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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'afff25534da580725acc283e5a9685aa4f9a8af2a733d03d11a2844f2bd52cfa' 
  AND token = '1AKEQ37XER+QGZiKLo1d4rJUWq0nevtCLdZup/Z6HKg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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