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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9e9dcc7d70f7a1b30b5769dfc1d3ffb56997249d7d418d15d5c54f93da300155' 
  AND token = 'AYMaEwy2wPJ4YwuLfjevaJ4VDsC6K4ZhPTfR3Nn4ezM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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