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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6aab0ee94b04dd465704ebfb6e2371adc02fcc428374a1dca6d32cf0225014a6' 
  AND token = 'mYd7JOI1jgQURa0cTy3n3Zvm1N7BBQs2MbkeXiXaIfU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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