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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8518fd3b32eab72b50a7deb7ff28b93f47c93d478d74ea38d892974b3690231f' 
  AND token = '6MImgjWEDgMHr2ryj+kZciHjb94TAZ0b4yQ1IDtkBz0=' 
  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"
    }
  }
}