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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9769ff65c86611c54d58b08c616d9c107cf14db34a393aa91fe5213e241af4c6' 
  AND token = 'XyhZ5XFR6v89UFaGUW7Sjjb9D7vfsBVBTnojzWAgFSg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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