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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '294a7e2ac9c3c6bed256d2da393be6a48ddb322298f3649815e09790b599a7e4' 
  AND token = 'QbVt0c8/wriwvyGpx8W04FoAY5s5/C/b+8K2zYcpnk8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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