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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '85ebaa036e735b75ab7e48f74c09c43a793de2b61dd460e5a5335e843fbacd65' 
  AND token = '0o8V8jJ4CNNdPn0WbELZEkp/18C6SLM2B1MbaoF8nzY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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