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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8cb47951c4631994a23d2ed0724d88a490e5dc7b734e033005f9964985e3d8cf' 
  AND token = 'YTptIIDvN5t6MIagKBGdW9rT0rX7WapRZv9ZOB3B6PI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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