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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '65ee3333d6582d8a5b42d35f57daeaa8e2cbcc6f022d30b70a789430cc71d724' 
  AND token = 'F3WzZgdMBB1Vwl9jd2sujTwVdxZtSA8I8PWe+qaj+3A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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