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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2893f5d252ef59d6e96e50e8a134c3fc157b8571380107e07b364e0c51aac7fe' 
  AND token = 'KPgoK7vXTKdQLDz7JmNfmTdTS3V9SIxiFSC4AGkXMTE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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