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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'da66234622f01f464261e3892435e75e3b5d195b7356e2759c54181fbab3c0c7' 
  AND token = 'f2Sr97RzkJQtmMlH7lOdX6efhIrZYfUz2HzU5vv6ngY=' 
  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"
    }
  }
}