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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '46f251aa55e6359f9453822a8db5a43e7a51d2732d49ef72a109dd432ab1c7e9' 
  AND token = 'h2EJs9EvHtr0giUd17kCzyYCyZUT8PZye27NH6Ti5UY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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