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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bb09bdcde3e98bab62ea755c0f51274f66e49fa8b49c3dc0079f18923a8f5ed2' 
  AND token = '8T+OpVp8SGeYK+28tw43Du1XmwCfomVjZSB4CVU8SiU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00012

JSON explain

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