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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9e4cf6eb8694209dfe5553c04bbf14e20e8fb8befa6c58e1c4785b030b3b24c8' 
  AND token = '2mjQeKukXtNEvtCVQU8fzAJ5Vrjkcdxz8obXWF9oMQw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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