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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1962d4eebb348ced487110606d95f473e06a720f49ae91923a4ad13a2157764c' 
  AND token = 'kr/9bXxh06R7tO3y/BtgYUdWnjm6/HVwrfjYuZ6VKuk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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