SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9d19a2e659d864b7ac6d95d4c3ec5751d1b0e0261a42b3e2bd90e3df0769208f' 
  AND token = 'mYs+gSnuAIo5oQvXP+BLcNlVdlnrg8iXtSz9mJFjmXU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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