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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5c538bfd1ca002d95eb8bb0d21032fe026c0a6d4881ec53c1ea325017fe113b2' 
  AND token = 'aTNvsLwmYhTXohShDM341iT3upjTdyZQ/JHLT1F12fs=' 
  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"
    }
  }
}