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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ca3b91f2e1ac6bd6b16e9036288eed1434ea3e933c48c1a44bf94810a971ca1f' 
  AND token = 'DVs/7x1OUeUpkvKIrH9xHWuGpp2Tvr6V1jeRdeZprns=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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