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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5cc4fdaf1f2d1e95a7f7713ad8ef4aa23d367e35d408765edd52f6e679f8ecd0' 
  AND token = 'rx1HxuCaOaQQftyMbbUUC/tRm/des5t0hxrRvVBV5wE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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