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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd87ec23d6c9d2a8110377f6cb02017a655eb99a278f01780f554410784abc02e' 
  AND token = '0tfcq0lHXkVdfleu1rzyunLZKvlYvDjxYMXEGotclYc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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