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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eb1971573890054352b021e33d8df9da281a7f4b1861e32a807f0fb7b7f385c7' 
  AND token = 'xD/9rqWaHJJ/RsYOlx7WUHfiQBsnwDD/SPBru9h3SRQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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