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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '008a6aedf7a8515a9391a3c2d830581f6799bef6b98344da3388b391bfe9c2f1' 
  AND token = 'a+7eNynTdOUXwtf95TvfBYD3BXw26WFY+yMXN3OrqRU=' 
  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"
    }
  }
}