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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5137474c584943c77a95b4fe43762e0de5d06079bd329eb5e3e2d2e034674ea3' 
  AND token = 'qXufVgzurrK0qfL4cOdPnHPjC0hiRDMwd0aqDwsbw78=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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