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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6d571e178b64257b31621e648a6139716768865ec1366d3c10218921480ec2fc' 
  AND token = 'M+V2/8XFyzxnZEUL8TubM1cWb7ZR3QUcqRwjOpfhDew=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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