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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a23bd9d5d40142809a1fcd32d874ba09a4252745caf221870e6fd05d00c6f071' 
  AND token = 'Q4CGcT8jPvbEay+FaFN8hwiM2AYyjH9Q3U7DBPPGs84=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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