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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a4f0884e8e100ef2d4a4314e368b90c57dff0fe9a65af0a001eddcbea720d382' 
  AND token = 'ILf0T2fjx6F9K7VSfsu1YJ39scq2bIKH7nGIZe7Kmso=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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