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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dda6431abef8c58e8e8b5a6063930dbbd79b7ced0df580f9395a8a0088fca4c6' 
  AND token = 'TaHgsL23TGyQm1VgWhKN6mRSn6P8AMaBALnZImfIHY8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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